Iblis is the name for the devil in the Qur'an. Although the term
"devil" comes from the Greek diabolos, the Muslims derived
the name from the Arabic, balasa, "he despaired," which
can be interpreted "despaired of the mercy of God" but he is also
al-Shairan, Satan, and "the enemy of God." The latter aspect of
Satan is a commonly shared belief of both Muslims and Christians. According
to one tradition, when Allah ordered the angels to bow down to the newly
created man, Adam, Iblis refused to
do so because he, being made of fire, thought himself superior to a creature
made of earth. He continues tempting humans, especially through the whisper
(waswas, "he whispered") and false suggestion (haiif).
In the end, it is believed, he will be cast into Jahannam.
Another commonly shared belief held by both religions is that the universal
existence of evil in personal lives is usually experienced as a consequence
of a personal agent, the devil.

Although both Satan and al-Shairan are identified, Shairan also has a
distinct existence, perhaps as the leader of the jinns,
a personification of temptation. This coincides with the Muslim belief that
each individual is accompanied by two personal spiritual entities; an angel
who urges toward good and a shairan who urges toward evil.A.G.H.

Source:

Bowker, John, The Oxford Dictionary of World Religions,
New York, Oxford University Press, 1997, p. 273